Ingot-mold.



C. W. GREENE, DECD.

H. GREENE. ADMINISTRATRIX.

INGOT MOLD.

APPLICATION FILED JAN. 5. 1914.

Patented Nov. 7, 1916.

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CHARLES W. GREENE, 0F PITTSBURGH, PENNSYLVANIA; HELEN GREENE ADMINIS- TRATRIX 0F SAID CHARLES W. GREENE, DECEASED.

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Specification of Letters Patent.

Patented Nov. "2', 19116.

Application filed January 5, 1914. Serial No. 810,367.

To all whom it may concern Be it known that I, CHARLES W. GREENE, a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Ingot- Molds; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to ingot molds for the casting of steel, its object being to provide a mold by which the heat in the upper part thereof is so conserved as to hold the upper part of the ingot in a molten condition, so as to feed such molten metal down into the body thereof, and overcome piping.

It consists, generally stated, in an ingot mold having formed in the upper part thereof a continuous dead air chamber around and over the metal receiving portion of the mold to hold the metal in the upper portion thereof molten, to feed down into the body of the ingot as it sets.

It also consists in providing around the upper part of the main body of the mold, an inclosing casing extending above such main body and combining therewith a cover which together with the outer wall, forms the inclosing dead air chamber.

It also consists in other improvements hereafter referred to.

In the accompanying drawings, Figures 1 to 4 illustrate vertical sections of difl'erent forms embodying the invention. Fig. 5 is a top view of the mold shown in Fig. 1, the cover being removed; and Fig. 6 is a top view of Fig. 3.

The mold embodying theinvention may be formed of an integral casting of iron or steel or it may be formed in different parts or sections as desired. For example, in Fig. 1, the body portion of the mold is shown at 2, such body ortion having the thick lower portion 3 and the thin upper portion 4, forming the inclos'ing ingot cavity 5, and having a separate section or casing 6 secured around the upper part of the mold, for any desired lenlgthv thereof, forming around the upper portion of the ingot mold, the dead-air chamber or space 7. In its preferred form this casing extends some distance above the top of the ingot mold proper, so as to form a like dead-air space 8 above the mold proper, a suitable cover 9b'eing seated on the top of the outer cas-.

ing 6 and so forming a continuous inclosed dead air chamber around and over the ingot mold. In Fig. 1 this casing 6 is formed separate from the body of the mold and the two are connected by bolts 12 and keys 13 so that the two are handled practically as a single mold. When so formed in sections, the joint 14.- between the two sections is grouted so as to form a sealed joint and prevent entrance of air into the dead-air chamber 7. The cap or cover 9 rests upon the upper edge of the mold and the joint between the two is also preferably seated in grouting as at 15. The grouting can be applied before or after the pouring of the ingot. The cast metal cover is preferably recessed as at 16 to receive a filling of fire clay or the like, so as to prevent the radiation of heat through the same. The cover has a central outlet port 17 permitting escape of gases which might raise the pressure within the dead-air chamber, it being preferred that such port be closed in any suitable way, such as by the brick 18. In the use of such mold, the ingot is poured in any suitable way, either from above or below, and when filled the cover is applied and sealed in the grouting, and will be retained in position by its own weight. If desired, the cover may be heated before being placed in position. During the cooling of the ingot, the heat of the upper part thereof is held within the dead-air chamber, and the air within said chamber is rapidly raised to practically the heat of the molten steel itself, and the thin upper body of the mold becomes highly heated; the heat in the up per part of the mold being thus confined and conserved within the dead-air chamber. The heat passing through the mold walls into the lower part of the dead-air chamber rises therein and is added to that in the upper part of the chamber, an extremely high heat being so developed, sufficiently high to maintain the metal in the upper part of the ingot in full molten condition while the body of the ingot below the same is setting or freezing. Thus, because of the high heat maintained within the dead-air chamber, inclosing the upper part of the ingot, the metal is held molten for such period that it will feed down into the lower portion of the ingot so filling the mid portion thereof as it chills and shrinkage occurs preventing the formation of a pipe diately heat up the thin upper portion of the main ingot mold and the surrounding body of air within the dead air chamber so that the inclosing wall 4 of the ingot mold is held at sufiiciently high heat to prevent chilling of such upper portion of the ingot, so thatthe ingot will sink down slowly and the molten metal be fed into the lower portion of the ingot body, and a solid ingot without pipe or having .but a shallow piping is formed.

The other figures of the drawing illustrate different forms of molds embodying the invention; for example, in Fig. 2, the

mold body is integral, having the solid lower portion 21, and in the upper part thereof the inner wall 22 and outer wall 23, forming the dead-air chamber 24 between the two walls. This mold is illustrated as being bottom poured through the sprue 25. In Fig. 3, the mold is of the same construction as in Fig. 2, but the upper portion thereof is formed separate, being composed of a block of fire brick or other refractory material, as at 26, which extends above the ingot mold proper to form part thereof or to form a sink head. This sink head 26 rests upon the upper portion 27 of the ingot mold, the outer wall 28 thereof extending up above the sink head to inclose the refractory. block and that block being preferably held in place by bars 29 fitting in bayonet seats 30, thus holding the block in place. This is illustrated in Fig. 6. When so used, these re fractory blocks are heated in a suitable furnace, and just prior to the pouring of the ingot, are dropped into place, the bars 29 fitted into the seats 30 above the block, and wedges 31 may be driven under the bars to hold the block firmly in place.

Fig. 4 illustrates the invention as applied in the form of a separate metal sink head above the ordinary ingot mold. As illustrated the mold is composed of the main mold body 33 having-the lugs 34, and the sink head 35- having the lugs 36, and the outer casing 37 having the lugs 38, the several parts being secured together in suitable way such as by bolts 39 properly keyed, suitable grouted joints 40 and 41 being employed between the several castings. With this embodiment of the invention, the sink head portion with its inclosing casing, can, if desired, be heated prior to its being secured to the mold body.

The mold works in practically the same way in the difi'erent forms illustrated, each providing a continuous dead-air chamber; around the upper portion of the mold. The

.air confined within such dead-air chamber above described.

What I claim is: 1. An ingot mold having a main body portion and having a casing around the upper part thereof, and extending above the mold proper and providing a dead-air chamber around the same, an mclosmg cap or cover supported on said outer casing and having a sealed joint therewith.

2. An ingot mold having a main body portion to retain the ingot, a casing around the same providing a dead air chamber and a cap or cover seated and sealed on top of the casing and having a relief opening therein.

3. An ingot mold havingamain body portion, a separate casing extending around and above the upper part of the body portion and forming a dead-air space around and above the same,a cap or cover fitting on the casing, the joints between the casing and the mold body and cap being sealed.

4. An ingot mold having a main body portion to retain the ingot and having a separate casing fitting around the upper part of the main body portion forming a dead air space around the top of the mold and having carrying lugs, and connecting means between said casing and body portion providing for the carrying of the mold by means of the casing.

5. An ingot mold having a main body portion to retain the ingot and having a separate casing fitting around the upper part of the main body portion forming a dead air space around the top of the mold and having carrying lugs, said casing and body portion each having lugs and bolts passing through the same and keyed to connect them so providing for carrying of the mold by means of the casing.

In testimony whereof, I the said CHARLES W. GREENE, have hereunto set my hand.

CHARLES w. GREENE.

Witnesses:

T. B. HUMrHRms, JOHN F. WILL. 

